Power rock-drill.



S. S. STEVENSON.

POWER ROCK DRILL.

'APPLIOATION FILED .TUNEB, 1909.

97%726, Patented Oct. 11,1910.

2 SHEETSSHEET 1.

A TTOR/VE V8 S. S. STEVENSON.

POWER ROCK DRILL.

APPLICATION FILED JUNE 3, 1909.

mm M Mn 7 m5 Lu MN VE E 7 E mm E a k F d m J m M a P Q w E r w, a 9 5 4 w a m a L 9 /T 2 p 7 1 9 /Q ATTORNEYS lif STERLING STANLEY- s'rnvn'nsou, or SALTILLO, MEXICO.

P WER ROCK-DRILL.

Specification of Letters latent.

Patented Got. 11, iiill}.

Application filed June 3, 1909. SerialNo. 499,840.

after described and claimed.

. passed bolts or rivets 5 for securing the sec- Referring to the drawingsforming a part hereof: Figure ,1 is a front view of the inn provement, 2 isa longitudinal section of the drill and support, and Fig. 3 is a perspective view of the liftinglink;

The drill mechanism comprises a framev composed of sections 1 and 2, each of which is marginally flanged as at 3, and provided with openings 4:, through which may be time together.;- The drill 6 which may be of any suitable construction, and as shown is of octagon shape, is supported by a holder 7, which is provided with a gear ring 8, and is journaledin'a two-part bushing 9, 9. Each section'- of the bushing is provided with an annular .rib 10, which seat in annular grooves 11 in the frame, and the sections of the bushing are spaced apart to receive the ring 8 therebetween. v

12, preferably of steel, .and the cap is centrally perforated as at 1,3, to permit. the- The holder is protected by a cap passage of the upper end of the drill. A

striking weight or hammer 14 isslidable in guideways 15 in the frame, above the cap,

and the weight is connected-to the lower cross bar 16 of a lifting link or loop 17, and the side members'of the link adjacent to the upper cross bar 18 are curved laterally in the same direction as at 19, for a purpose to be presently described. j p 1 The upper face of the hammer is recessed to'receive the lower cross bar, and a pair of U-shaped hangers 20, are arranged upon each side of the link, the threaded arms 21 of the hangers passingthrough the hammer 14, and being engaged by nuts 22, to retain the hangers in place. An elliptical spring is arranged between the hammer, andthe upper end of the frame, and the lower member 23 thereof, isreceived beneath the body portion of the hangers, and the said spring member rests upon the cross bar 16, and conneots the link with the hammer.

there being four wipers on the wheel.

The frame sections are longitudinally slotted-as at 24: to permit the spring members to extend beyond the sides thereof-arid I the upper faceof the upper spring member 23 engagesthe cap plate 25 of the frame, which is provided with acrossbar 26,-.and is connected to the frame sections by means of bolts 27, traversing flanges 28 and 29. on

the cap plate and the sections respectively. A power sha-ft'3'0 is journaled transversely of theframe in bearings 31,. and-the upper end 'of the lifting link extends alongside the said shaft, which received in the laterally curved port ons .19 before-mentioned.

, A Wiper cam 32 is secured to the shaft between the side members of the link, and the wipers 33 of the cam are adapted toengage and lift the linlqwhereby'to lift the hammer.

A flywheel 34 provided with a handle 35 is secured to the outer end of the shaft 30, and the inner end is provided with ,a bevel gear 36, which meshes with'a bevel gear 37, on-a vertical shaft 38 j ournaled in the frame,

and having at its lower end pinion 39.; which meshes wlth-the gear-ring 8 on thetool holder.

It will be evident from the description .that'. when the shaft 30 is rotated, the hammer will be lifted-against the pressure of the spring 2 3 23 and permit-' ted to drop by each wiper of the cam whe'el, the spring accentuating the drop, while at the same timethe drill is continuously rotated through the-vertical shaft 38. At

each end, the frameis'provided with a lateral arm 40 and the. said arms support a feeding mechanism 41, of'ordinary construction. The arms LOengage a guide shaft 57 which .is supported in the angular ends 155 of a frame 47, for use with a column attachment and having a ball mouth bearing {54, for the said attachment.

In operation, the hand wheel34 isrotated to cause the wipers of the cam wheel to en? gagethe upper cross bar of the link in succ'ession, thus lifting and dropping the hammer at the rate of four times per revolut ilplp, e drop of the hammer is emphasized Toy-the spring, and its recoil also assists the suceeeding wiper to raise the hammer.

The

hammer engages the extended end of the drill, and through the connection of the holder with the vertical shaft, the drill is stance, for the insertion-of a longer tlriih pawl is engaged with the ratchet Wheel, and 1 spring i. hummer, the shaft 30 is rotated. The pawl anal te "l he casing a ratchet connection causes the feed screw to turn, thus lifting the frame.

1 claim:

1. A power rock drill, comprising a sec 1 tionel frame provided. at its lower encl with i annular grooves, and with vertical guide ways above the grooves a two-part bushing consisting er upper and. lower members l spaced apart from each other each having L an annular rib for engaging a groove a tool holder rotatable in the bushing, and having anannular gear ring received between the members of the bushing, at protecting cap above the holder and having a central open ing for the passage of the drill end, a herniner slidable in the gnideways, a power shaft journalecl transversely of the frame above the hammer, a Wiper cam wheel on the shaft provided with a plurality of Wipers, a lifting link comprising spaced parallel side bars connected at each end by an integral cross bar, the hammer having a recess on its upper face for receiving the lower cross bar of the lifting link, the upper cross bar being arranged above the cam Wheel for engagement by the Wipers, the side bars of the link having laterally curved portions for receiving the shaft an elliptical spring arranged between the shaft and the hammer, the lower member thereof resting upon the lower cross bar of the link, hangers engaging the spring mer a wiper cnn'i Wheel on th:

min.) "cll l ll.

grooves and ways move 1' groovesf two-part hris ng each part mg a no for eng g a groove, a-

ne bushing, a proteetholder rotatable in ing cap above the holder and having e (1823* (ml opening for the pass e oil he drill e; o a hammer sliclahle in. the ,nrlexvaygapo h shaft journalecl in the frame above 1- ing link the hammer having a upper face for TQCGlV -Q the lower the link, the upper end being arrangeii ilbu the cam Wheel for engagement the W J said link being lan -ally curved adjacent to the shaft, a spr. g arranged between ti 2 shaft and the hammer and normally p e, ing the said hammer downward plate secured. to the c; i: W tlr ripper end of the s; driving connection het'iv the tool holder for f htatii 

